package org.biblicalcontent.ui.navigator.views;

import java.util.ArrayList;
import java.util.List;

import org.biblicalcontent.ui.generiek.ExtentionReader;
import org.biblicalcontent.ui.generiek.NavigatorContentProvider;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.DrillDownAdapter;
import org.eclipse.ui.part.ViewPart;

/**
 * This sample class demonstrates how to plug-in a new workbench view. The view
 * shows data obtained from the model. The sample creates a dummy model on the
 * fly, but a real implementation would connect to the model available either in
 * this or another plug-in (e.g. the workspace). The view is connected to the
 * model using a content provider.
 * <p>
 * The view uses a label provider to define how model objects should be
 * presented in the view. Each view can present the same model objects using
 * different labels and icons, if needed. Alternatively, a single label provider
 * can be shared between views in order to ensure that objects of the same type
 * are presented in the same way everywhere.
 * <p>
 */

public class ContentNavigator extends ViewPart {

	private static final String EXTENSION_ATTRIBUTENAME = "providerClassName";

	private static final String NAVIGATOR_CONTENTPROVIDER_EXTENSIONID = "org.biblicalcontent.ui.navigator.navigatorContentProvider";

	/**
	 * The ID of the view as specified by the extension.
	 */
	public static final String ID = "org.biblicalcontent.ui.navigator.views.ContentNavigator";

	private List<NavigatorContentProvider> contentProviders = new ArrayList<NavigatorContentProvider>();

	private TreeViewer viewer;
	private DrillDownAdapter drillDownAdapter;
	private Action action1;
	private Action action2;
	private Action doubleClickAction;

	// /*
	// * The content provider class is responsible for providing objects to the
	// * view. It can wrap existing objects in adapters or simply return objects
	// * as-is. These objects may be sensitive to the current input of the view,
	// * or ignore it and always show the same content (like Task List, for
	// * example).
	// */
	//
	// class TreeObject implements IAdaptable {
	// private String name;
	// private TreeParent parent;
	//
	// public TreeObject(String name) {
	// this.name = name;
	// }
	//
	// public String getName() {
	// return name;
	// }
	//
	// public void setParent(TreeParent parent) {
	// this.parent = parent;
	// }
	//
	// public TreeParent getParent() {
	// return parent;
	// }
	//
	// public String toString() {
	// return getName();
	// }
	//
	// public Object getAdapter(Class key) {
	// return null;
	// }
	// }

	class ViewLabelProvider extends LabelProvider {

		public String getText(Object obj) {
			return obj.toString();
		}

		public Image getImage(Object obj) {
			String imageKey = ISharedImages.IMG_OBJ_ELEMENT;
			return PlatformUI.getWorkbench().getSharedImages().getImage(imageKey);
		}
	}

	class NameSorter extends ViewerSorter {
	}

	/**
	 * The constructor.
	 */
	public ContentNavigator() {
	}

	@Override
	public void init(IViewSite site) throws PartInitException {
		super.init(site);

	}

	/**
	 * This is a callback that will allow us to create the viewer and initialize
	 * it.
	 */
	public void createPartControl(Composite parent) {
		ExtentionReader reader = new ExtentionReader(NAVIGATOR_CONTENTPROVIDER_EXTENSIONID, EXTENSION_ATTRIBUTENAME);
		List<NavigatorContentProvider> providers = reader.loadExtensions(NavigatorContentProvider.class);
		contentProviders.addAll(providers);

		viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
		drillDownAdapter = new DrillDownAdapter(viewer);
		viewer.setContentProvider(new ViewContentProvider(getViewSite(), contentProviders));
		viewer.setLabelProvider(new ViewLabelProvider());
		viewer.setSorter(new NameSorter());
		viewer.setInput(getViewSite());

		getViewSite().setSelectionProvider(viewer);

		// Create the help context id for the viewer's control
		PlatformUI.getWorkbench().getHelpSystem()
				.setHelp(viewer.getControl(), "org.biblicalcontent.ui.navigator.viewer");
		makeActions();
		hookContextMenu();
		hookDoubleClickAction();
		contributeToActionBars();
	}

	private void hookContextMenu() {
		MenuManager menuMgr = new MenuManager("#PopupMenu");
		menuMgr.setRemoveAllWhenShown(true);
		menuMgr.addMenuListener(new IMenuListener() {
			public void menuAboutToShow(IMenuManager manager) {
				ContentNavigator.this.fillContextMenu(manager);
			}
		});
		Menu menu = menuMgr.createContextMenu(viewer.getControl());
		viewer.getControl().setMenu(menu);
		getSite().registerContextMenu(menuMgr, viewer);
	}

	private void contributeToActionBars() {
		IActionBars bars = getViewSite().getActionBars();
		fillLocalPullDown(bars.getMenuManager());
		fillLocalToolBar(bars.getToolBarManager());
	}

	private void fillLocalPullDown(IMenuManager manager) {
		manager.add(action1);
		manager.add(new Separator());
		manager.add(action2);
	}

	private void fillContextMenu(IMenuManager manager) {
		manager.add(action1);
		manager.add(action2);
		manager.add(new Separator());
		drillDownAdapter.addNavigationActions(manager);
		// Other plug-ins can contribute there actions here
		manager.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));
	}

	private void fillLocalToolBar(IToolBarManager manager) {
		manager.add(action1);
		manager.add(action2);
		manager.add(new Separator());
		drillDownAdapter.addNavigationActions(manager);
	}

	private void makeActions() {
		action1 = new Action() {
			public void run() {
				showMessage("Action 1 executed");
			}
		};
		action1.setText("Action 1");
		action1.setToolTipText("Action 1 tooltip");
		action1.setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
				.getImageDescriptor(ISharedImages.IMG_OBJS_INFO_TSK));

		action2 = new Action() {
			public void run() {
				showMessage("Action 2 executed");
			}
		};
		action2.setText("Action 2");
		action2.setToolTipText("Action 2 tooltip");
		action2.setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
				.getImageDescriptor(ISharedImages.IMG_OBJS_INFO_TSK));
		doubleClickAction = new Action() {
			public void run() {
				ISelection selection = viewer.getSelection();
				Object obj = ((IStructuredSelection) selection).getFirstElement();
				showMessage("Double-click detected on " + obj.toString());
			}
		};
	}

	private void hookDoubleClickAction() {
		viewer.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				doubleClickAction.run();
			}
		});
	}

	private void showMessage(String message) {
		MessageDialog.openInformation(viewer.getControl().getShell(), "Content Navigator", message);
	}

	/**
	 * Passing the focus request to the viewer's control.
	 */
	public void setFocus() {
		viewer.getControl().setFocus();
	}
}